ST L4941 User Manual
Feature summary
■ Low dropout voltage (450mV typ. at 1A)
■ Very low quiescent current
■ Thermal shutdown
■ Short circuit protection
■ Reverse polarity protection
L4941
Very low drop 1A regulator
Description
The L4941 is a three terminal 5V positive
regulators available in TO-220 and DPAK
packages, making it useful in a wide range of
industrial and consumer applications. Thanks to
its very low input/output voltage drop, these
devices are particularly suitable for battery
powered equipments, reducing consumption and
TO-220
prolonging battery life. It employs internal current
limiting, antisaturation circuit, thermal shut-down
and safe area protection.
DPAK
Order code
Part number Package
L4941BV TO-220
L4941BDT-TR DPAK
September 2006 Rev. 5 1/17
www.st.com
17
L4941
Contents
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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L4941 Block diagram
1 Block diagram
Figure 1. Block diagram
3/17
Pin configuration L4941
2 Pin configuration
Figure 2. Pin connections (top view)
TO-220
DPAK
4/17
L4941 Maximum ratings
3 Maximum ratings
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
V
I
V
IR
I
O
P
D
T
stg
T
op
Forward input voltage 30 V
Reverse input voltage (RO=100Ω)-15V
Output current Internally Limited mA
Power dissipation Internally Limited mW
Storage temperature range -40 to +150 °C
Operating junction temperature range -40 to +150 °C
Note: Absolute Maximum Ratings are those values beyond which damage to the device may
occur. Functional operation under these condition is not implied
Table 2. Thermal Data
Symbol Parameter TO-220 DPAK Unit
R
R
thJC
thJA
Thermal resistance junction-case 3 8 °C/W
Thermal resistance junction-ambient 50 100 °C/W
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Test circuits L4941
4 Test circuits
Figure 3. DC Parameters
Figure 4. Load rejection
Figure 5. Ripple rejection
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